Can't change files after puppet-code has been archived

I wanted to work on https://gitlab.tails.boum.org/tails/tails/-/issues/21099 which involves changing site/profile/files/tails/jenkins/master/generate_tails_iso_jobs in puppet-code.

But puppet-code has been moved to tpo/tpa/puppet-control> , and I don't have access to that.

What's the workflow for me to work on that code?